The Great British Bake Off: An Extra Slice Guest cast, played by Iain Stirling Episode 7x05: Episode 5 (Oct 23, 2020) Episode 8x01: Episode 1 (Sep 24, 2021) Episode 9x04: Episode 4 (Oct 7, 2022) Episode 10x02: Episode 2 (Oct 5, 2023)